The Darwin VAAC reported that on 17 April ash plumes from Tengger Caldera?s Bromo cone rose to an altitude of 3 km (10,000 ft) a.s.l.
and drifted W, based on webcam images and satellite data.
On 21 April BNPB stated that ash emissions had been observed almost daily, and that tremor was recorded continuously.
The Alert Level remained at 2 (on a scale of 1-4), and visitors were warned to stay outside of a 1-km radius of the crater.
Sources: Badan Nacional Penanggulangan Bencana (BNPB) ,Darwin Volcanic Ash Advisory Centre (VAAC),Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)